SIEMENS ET 134-22 Low Temperature Detection Thermostat Instructions

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Technical Instructions  

Document No. 155-016P25  

ET 134-22  

April 12, 2018  

Powers Controls  

Low Temperature Detection  

Thermostat  

Description  

Features  

The electric Low Temperature Detection Cut-out and Alarm Thermostat is a remote bulb  

instrument which opens an electrical circuit to stop the supply fan motor and/or closes  

an outside air damper when the temperature at the sensing element falls below the  

setting of the instrument. Simultaneously, it closes a circuit to indicate an alarm  

condition.  

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Manual reset  

Easy temperature setting with adjusting screw on top of enclosure  

Mounting bracket and two screws included  

Main and separate reverse-acting auxiliary contacts  

Product Number  

134-1504  

Warning/Caution Notations  

Personal injury or loss of life may occur if a  

procedure is not performed as specified.  

WARNING  

CAUTION  

Equipment damage or loss of data may occur if you  

do not follow a procedure as specified.  

Application  

This instrument should only be used on those applications where the ambient  

temperature to which the instrument case and bellows are exposed remains above  

the temperature setting of the thermostat. This thermostat should be used in areas  

protected from the weather.  

Siemens Industry, Inc.  

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General	Details
Name	SIEMENS ET 134-22 Low Temperature Detection Thermostat Instructions
Make	SIEMENS
Language	English
Filetype	PDF (Download)
File size	0.1 MB

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• ALL THERMOSTAT INSTRUCTIONS & USER MANUALS
• SIEMENS

SIEMENS ET 134-22 Low Temperature Detection Thermostat Instructions Overview

Summary of Contents

• Page 1: Technical Instructions Low Temperature Detection Thermostat Description The electric Low Temperature Detection Cut-out and Alarm Thermostat is a remote bulb instrument which opens an electrical circuit to stop the supply fan motor and/or closes an outside air damper when the temperature at the sensing element falls below the setting of the instrument. Features Manual reset Easy temperature setting with adjusting screw on top of enclosure Mounting bracket and two screws included Main and separate reverse-acting auxiliary contacts Warning/Caution Notations Personal injury or loss of life may occur if a procedure is not performed as specified. Equipment damage or loss of data may occur if you do not follow a procedure as specified. Application This instrument should only be used on those applications where the ambient temperature to which the instrument case and bellows are exposed remains above the temperature setting of the thermostat.
• Page 2: Technical instructions for low temperature detection cut-out and alarm thermostat include important warnings and cautions regarding installation and operation. The thermostat is designed solely as an operating control, and additional safety devices are recommended to prevent personal injury or property loss. Upon receipt, the switch contact position may be open or closed due to exposure to freezing temperatures during shipping. It is advised to manually press and release the reset button before initial use to ensure normal operating state. Specifications detail the switch action, temperature range, maximum bulb temperature, minimum differential, and dimensions. The thermostat features a vapor-filled sensing element and has a manual reset action. Operation involves a temperature sensing element that actuates a heavy-duty contact through a rugged link mechanism. The main load circuit opens on temperature drop, while an auxiliary circuit closes simultaneously. The thermostat is suitable for protecting large coils against localized freezing conditions. The reset button must be pressed to resume normal fan system operation.
• Page 3: Low temperature detection cut-out and alarm thermostat Electrical ratings include various voltage and amp specifications. General guidelines for mounting and installation emphasize proper placement of the sensing element and accessibility of the reset button. The thermostat should be installed with the element bellows pointing down. It is important to avoid sharp bends or kinks in the sensing element. Instructions for mounting in large walk-in ducts detail the attachment of the mounting bracket and the proper orientation of the bulb. The bulb should be threaded through a drilled hole in the duct while coiled. The thermostat must be mounted on the outside of the duct. The bulb should be uncoiled carefully to avoid damage. An alternate mounting method using coil clips is suggested for holding the bulb in place.
• Page 4: Technical instructions for low temperature detection cut-out and alarm thermostat are provided. The document includes mounting and installation guidelines. A typical mounting example is illustrated in Figure 1. Instructions for limited access ducts are detailed. The mounting bracket should be attached to the thermostat using provided screws. A mounting flange needs to be attached on the opposite side of the duct from the thermostat. A second flange should be mounted on a sheet metal plate with an access opening for the bulb. Copper tubing must be cut to fit diagonally across the duct, with the bulb wrapped around it. The tubing and bulb should be inserted through the access hole into the duct-mounted flange. Finally, the thermostat must be mounted on the outside of the duct.
• Page 5: Low temperature detection cut-out and alarm thermostat Technical instructions Disconnect the power supply before wiring connections are made to avoid possible electrical shock or damage to the equipment. Make all wiring connections using copper conductors only and in accordance with the National Electrical Code and local regulations. Loads exceeding the rating of the thermostat should be handled by means of a relay or motor starter. An opening for 1/2-inch conduit is provided in the bottom of the thermostat enclosure. Use terminal screws furnished (#8-32 × 1/4-inch binder head screw). Longer terminal screws can interfere with switch mechanism and damage the switch.
• Page 6: Technical instructions for low temperature detection cut-out and alarm thermostat are provided. Adjust the temperature setting using the setpoint adjusting screw on the top of the enclosure. Observe a complete operating cycle to ensure all components function correctly. No field calibration is required for the thermostat. There is no servicing of the thermostat; replace if inoperative. Dimensions are provided in inches and millimeters. Information is based on current specifications, and changes may occur as design improvements are introduced. Powers is a trademark of Siemens Industry, Inc. Product or company names mentioned may be trademarks of their respective owners. Feedback on the document is encouraged.